# -*- coding: utf-8 -*-
'''
@summary: Módulo ExportFile.py efetua a exportaçao dos dados para um
ficheiro csv
 
@requires: 
	
@development environment:
Maquina Virtual com Debian7.1
Python 2.7
wxGlade

@author: Adriano Leal - 11951, Gonçalo Ferreira - 11958
@version: 2.4
@date: 04/12/2013
'''

import csv
import codecs
import cStringIO
from main import *


class UTF8Recoder:
    """
    Iterator that reads an encoded stream and reencodes the input 
    to UTF-8
    """

    def __init__(self, f, encoding):
        self.reader = codecs.getreader(encoding)(f)

    def __iter__(self):
        return self

    def next(self):
        return self.reader.next().encode("utf-8")


class UnicodeReader:
    """
    A CSV reader which will iterate over lines in the CSV file "f",
    which is encoded in the given encoding.
    """

    def __init__(self, f, dialect=csv.excel, encoding="utf-8", **kwds):
        f = UTF8Recoder(f, encoding)
        self.reader = csv.reader(f, dialect=dialect, **kwds)

    def next(self):
        row = self.reader.next()
        return [unicode(s, "utf-8") for s in row]

    def __iter__(self):
        return self


class UnicodeWriter:
    """
    A CSV writer which will write rows to CSV file "f",
    which is encoded in the given encoding.
    """

    def __init__(self, f, dialect=csv.excel, encoding="utf-8", **kwds):
        # Redirect output to a queue
        self.queue = cStringIO.StringIO()
        self.writer = csv.writer(self.queue, dialect=dialect, **kwds)
        self.stream = f
        self.encoder = codecs.getincrementalencoder(encoding)()

    def writerow(self, row):
        self.writer.writerow([s.encode("utf-8") for s in row])
        # Fetch UTF-8 output from the queue ...
        data = self.queue.getvalue()
        data = data.decode("utf-8")
        # ... and reencode it into the target encoding
        data = self.encoder.encode(data)
        # write to the target stream
        self.stream.write(data)
        # empty queue
        self.queue.truncate(0)

    def writerows(self, rows):
        for row in rows:
            self.writerow(row)


def exportar_ficheiro(nome, valor):
    """
    Exporta os dados das estatisticas para ficheiros no formato .csv
    Este código foi baseado no exemplo 
    http://www.whit.com.au/blog/2011/11/reading-and-writing-csv-files/
    :param nome: Recebe parametro para no nome do ficheiro.
    :param valor:Recebe a lista com as estatisticas.
    """
    ## open a file for writing.
    csv_out = open(nome + '.csv', 'wb')
    csv_ = UnicodeWriter(csv_out, quoting=csv.QUOTE_ALL)

    for value in valor:
        csv_.writerow([value[0], str(value[1])])

    csv_out.close()

